An extruder for use in a plastic extrusion process comprises a plurality of extruder members. Each extruder member comprises a plate portion and a hollow tubular portion perpendicular to the plate portion. The plate portions of the extruder members are located side by side with one another and define a first plastic handling part of the extruder in which there is firstly a feeding and then a transition of plastic material fed to the extruder. The tubular portions of the extruder,members which are telescopically interfitted with one another define a second plastic handling part of the extruder for metering of plastic flow output from the extruder.
